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the Havasu Lake and Imperial National Wildlife Refuges, a maximum of 60,339 acre-feet per annum; however, the amount actually available within the total will be dependent, among other things, upon the relative priorities for the refuges as against other priorities recognized under the Boulder Canyon Project Act in the States of use. Thus, additional water requirements amount to about 301,000 acre-feet of consumptive use per year, a portion of which will be supplied by Colorado River water. Should Salton Sea recede substantially, an additional amount of water, up to 60,000 acre-feet annually, would be needed to serve the National Wildlife Refuge already established there. A non-consumptive use of 627 second-feet of flow for fish hatcheries also is indicated, of which 268 second-feet are now valid existing uses. Increased uses of mainstream Colorado River water for fish and wildlife purposes are proposed in this Appendix. Approval by the Congress of the fish and wildlife installations proposed herein would give legislative approval also to utilization of mainstream Colorado River water for these purposes to the extent that such water is not otherwise committed to valid existing rights. It is not proposed to impair any existing rights to such water. In California the several water delivery contracts between the United States and various California entities and certain other rights recognized under the opinion in Arizona v. California, et al. (373 U.S. 546) encompass all the water available for consumptive use in California within a total of 7,500,000 acre-feet of mainstream water available for lower basin consumptive use each year. It may be possible, however, to assure a water supply for the proposed fish and wildlife installations in California requiring mainstream water by reasonable accommodation among the California users. In addition it is anticipated that water will be developed under the extension of the initial plan which will be available for fish and wildlife facilities in California. Also, water could be made available during interim periods from facilities of the initial plan. In Arizona and Nevada, present rights to the use of mainstream water are substantially less than the States' entitlements to consumptive use within a total of 7,500,000 acre-feet per annum. Thus, if the proposed fish and wildlife developments are approved by the Congress, water for fish and wildlife uses would be reserved from the unallocated portions of these States' shares of Colorado River water. Increased uses on lower basin tributaries are also proposed, principally in Arizona. Water for increased uses in Arizona could be made available by direct deliveries or exchanges through the proposed Central Arizona Project. Similarly, increased consumptive uses of water from the Gila River System in New Mexico could be made on an exchange basis, although a compromise agreement between New Mexico and Arizona recently approved 9Epson Perfection 4870 Photo, 400 dpi, 8 bit, 14,020,608 byte